A298901 - OEIS

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A298901 as a simple table

n	a(n)
1	0
2	8
3	12
4	56
5	471
6	4689
7	44186
8	522001
9	5379458
10	62969638
11	689301117
12	7995632432
13	89669878606
14	1030894396261
15	11694235466700
16	133810754113662
17	1523947269885410
18	17410346219635865
19	198543925466100523

[0,8,12,56,471,4689,44186,522001,5379458,62969638, 689301117,7995632432,89669878606,1030894396261, 11694235466700,133810754113662,1523947269885410, 17410346219635865,198543925466100523]